This paper presents an experimental analysis of the electrical and optical
behaviour of positive point-plane corona discharges. The measurements of the
instantaneous corona current and the current-voltage characteristics are
used with the imagery analyses (CCD and streak camera) to determine the
streamer properties such as the streamer morphology and velocity with the
primary and secondary streamer developments. These analyses are performed
first in synthetic air as a function of operating parameters such the
applied voltage. Then the effect of gas mixtures (several proportions of
N2, O2 with or without CO2) is analysed. When the gas
concentration is varied the discharge morphology, the shape and amplitude of
the corona current are significantly affected due to the variation of the
gas electronegativity following its composition and concentration.

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